Brief Description

Sasser.B is a worm that spreads via the Internet by exploiting the LSASS vulnerability in remote computers. This vulnerability is critical for Windows XP/2000 operating systems that are not properly updated.

Sasser.B restarts the computer automatically when it attempts to exploit the already mentioned vulnerability.

Sasser.B only spreads automatically to Windows XP/2000 computers. However, computers with other Windows operating systems can also be a source of transmission when a malicious user runs the file containing the worm in any of these computers.

If you have a Windows XP/2000 computer, it is highly recommendable to download the security patch for the LSASS vulnerability from the Microsoft website.

Visible Symptoms

Sasser.B is easy to recognize, as it restarts Windows XP/2000 computers when it attempts to affect them by exploiting the LSASS vulnerability. When this action is carried out, Sasser.B displays the following message on screen: